OVERVIEW OF THE IMMUNE SYSTEM
LYMPHATIC AND IMMUNE SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They are caused by bacteria
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Vaccines have dramatically reduced the number of people who catch them
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They mutate frequently
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They have been completely wiped out by vaccines
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Detailed explanation-1: -Is the smallpox vaccine recommended? The smallpox vaccine is currently not recommended for the general public. The vaccine is now being offered to those who may be called upon to respond in the event of a smallpox case or outbreak. Routine smallpox vaccinations in the U.S. stopped in 1972.
Detailed explanation-2: -The smallpox vaccine protects people from smallpox by helping their bodies develop immunity to smallpox. The vaccine is made from a virus called vaccinia, which is a poxvirus similar to smallpox, but less harmful.
Detailed explanation-3: -It is impossible to know very exactly how many people would have died of smallpox since 1980 if scientists had not developed the vaccine, but reasonable estimates are in the range of around 5 million lives per year, which implies that between 1980 and 2018 around 150 to 200 million lives have been saved.
Detailed explanation-4: -Length of Protection Historically, the vaccine has been effective in preventing smallpox infection in 95% of those vaccinated. In addition, the vaccine was proven to prevent or substantially lessen infection when given within a few days of exposure.